<template>
  <div>
    <!--面包屑导航-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!--    卡片视图区域-->
    <el-card>
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon :closable="false">
      </el-alert>
      <!--      步骤条 :active 表示当前到了哪一步-->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success"
                align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef"
               label-width="100px" label-position="top">
        <!--      标签页 v-model是与name的数值一致的，然后又绑定到了activeIndex-->
        <el-tabs v-model="activeIndex" :tab-position="'left'"
                 :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类">
              <!--              级联选择器-->
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="{ expandTrigger: 'hover' ,label:'cat_name',value:'cat_id',children:'children'}"
                @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!--            渲染表单的Item项-->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData"
                          :key="item.attr_id">
              <!--              复习框组-->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals"
                             :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData"
                          :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!--            action属性表示图片请求上传地址 后天的API地址-->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!--            富文本编辑器-->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!--            添加商品的按钮-->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!--    预览图片对话框-->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
  import _ from 'lodash'

  export default {
    data () {
      return {
        //激活的步骤
        activeIndex: '0',
        //  添加商品的表单数据对象
        addForm: {
          goods_name: '',
          goods_price: 0,
          goods_weight: 0,
          goods_number: 0,
          goods_cat: [],
          pics: [],
          //  商品的详情描述
          goods_introduce: '',
          attrs: []
        },

        //表单校验规则
        addFormRules: {
          goods_name: [{
            required: true,
            message: '请输入商品名称',
            trigger: 'blur'
          }],
          goods_price: [{
            required: true,
            message: '请输入商品价格',
            trigger: 'blur'
          }],
          goods_weight: [{
            required: true,
            message: '请输入商品重量',
            trigger: 'blur'
          }],
          goods_number: [{
            required: true,
            message: '请输入商品数量',
            trigger: 'blur'
          }],
          goods_cat: [{
            required: true,
            message: '请选择商品分类',
            trigger: 'blur'
          }]
        },
        cateList: [],
        //动态参数列表数组
        manyTableData: [],
        onlyTableData: [],
        //  上传的url地址
        uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
        //图片上传组件的headers请求头对象
        headerObj: {
          Authorization: window.sessionStorage.getItem('token')
        },
        //  预览图片的路径
        previewPath: '',
        previewVisible: false,
      }
    },
    methods: {
      async getCateList () {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) return this.$message.error('获取商品分类数据失败')
        this.cateList = res.data
      },
      //级联选择器选中项变化会触发该函数
      handleChange () {
        if (this.addForm.goods_cat.length !== 3) this.addForm.goods_cat = []
      },
      beforeTabLeave (activeName, oldActiveName) {
        // console.log(activeName + '-----------' + oldActiveName)
        // return false
        if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
          this.$message.error('请先选择商品分类')
          return false
        }
      },
      async tabClicked () {
        //如果为1的话打开的是动态参数面板
        if (this.activeIndex === '1') {
          const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
            {
              params: { sel: 'many' }
            })
          if (res.meta.status !== 200) return this.$message.error('获取动态参数列表失败')
          res.data.forEach(item => {
            item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
          })
          this.manyTableData = res.data
        } else if (this.activeIndex === '2') {
          const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
            {
              params: { sel: 'only' }
            })
          if (res.meta.status !== 200) return this.$message.error('获取静态属性列表失败')
          this.onlyTableData = res.data
        }
      },
      //处理图片预览效果
      handlePreview (file) {
        this.previewPath = file.response.data.url
        this.previewVisible = true
      },
      //处理移除操作
      handleRemove (file) {
        //  1.获取将要删除的图片的临时路径
        const filePath = file.response.data.tmp_path
        //  2.从pics数组中找到这张图片对应的索引值
        const i = this.addForm.pics.findIndex(x => s.pic === filePath)
        //  3.调用数组的splice方法，把图片信息对象，从pics数组中移除
        this.addForm.pics.splice(i, 1)
      },
      //监听图片上传成功的事件
      handleSuccess (response) {
        //1.拼接得到一个图片信息对象
        const picInfo = {
          pic: response.data.tmp_path
        }
        //2.将图片信息对象，push到price中,push 表示追加进去一个
        this.addForm.pics.push(picInfo)
      },
      //添加商品
      add () {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) return this.$message.error('请填写必要的表单项！')
          //  执行添加的业务逻辑
          //先进行深拷贝
          const form = _.cloneDeep(this.addForm)
          form.goods_cat = form.goods_cat.join(',')
          //  处理动态参数
          this.manyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals.join(' ')
            }
            this.addForm.attrs.push(newInfo)
          })
          //  处理静态属性
          this.onlyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals
            }
            this.addForm.attrs.push(newInfo)
          })
          form.attrs = this.addForm.attrs
          //  发起请求添加商品
          const { data: res } = await this.$http.post('goods', form)
          if (res.meta.status !== 201) return this.$message.error('添加商品失败！')
          this.$message.success('添加商品成功！')
          //通过编程式导航跳转到商品页面
          this.$router.push('/goods')
        })
      }
    },
    //计算属性
    computed: {
      cateId () {
        if (this.addForm.goods_cat.length === 3) {
          return this.addForm.goods_cat[2]
        }
        return null
      },

    },
    created () {
      this.getCateList()
    }
  }
</script>

<style lang="less" scoped>
  .el-checkbox {
    margin: 0 10px 0 0 !important;
  }

  .previewImg {
    width: 100%;
  }

  .btnAdd {
    margin-top: 15px;
  }
</style>
